$13/19: File number of current Input Device
Kernal-Reference:
BIT $13 : $AADC
LDA $13 : $AAD3 $AB3B $AB62 $ABB5 $ABD9 $ABEF $ABF9 $AC43 $ACF0
LDX $13 : $ABA0
STA $13 : $A44C $E380 $E3F2
STX $13 : $AA91 $AB8D $ABAD $ABBC
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